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Question (1)

QN0032695

Which multiplication can be solved easily by using the doubling and halving strategy?

(A) 18 × 5
(B) 17 × 7
(C) 19 × 13
(D) 23 × 11

Correct Answer: A

Explanation:

Multiplication involving 5 is convenient for the doubling and halving strategy.

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Question (2)

QN0032696

In the doubling and halving strategy, what happens to the product when one factor is doubled and the other factor is halved?

(A) The product doubles.
(B) The product becomes half.
(C) The product remains the same.
(D) The product becomes zero.

Correct Answer: C

Explanation:

Doubling one factor and halving the other keeps the product unchanged.

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Question (3)

QN0032697

Using doubling and halving, 5 × 24 can be written as

(A) 10 × 12
(B) 20 × 6
(C) 2 × 60
(D) All of these

Correct Answer: D

Explanation:

All the given expressions have the same product as 5 × 24.

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Question (4)

QN0032698

Find the value of 25 × 8 using doubling and halving.

(A) 100
(B) 150
(C) 200
(D) 250

Correct Answer: C

Explanation:

25 × 8 = 50 × 4 = 100 × 2 = 200.

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Question (5)

QN0032699

Which pair of numbers is obtained after one step of doubling and halving 16 × 5?

(A) 8 × 10
(B) 32 × 2.5
(C) 10 × 8
(D) 20 × 4

Correct Answer: A

Explanation:

Half of 16 is 8 and double of 5 is 10.

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Question (6)

QN0032700

What is 18 × 5?

(A) 80
(B) 85
(C) 90
(D) 95

Correct Answer: C

Explanation:

Half of 18 is 9 and double of 5 is 10. So, 9 × 10 = 90.

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Question (7)

QN0032701

Which multiplication is most suitable for the doubling and halving strategy?

(A) 25 × 16
(B) 17 × 19
(C) 29 × 27
(D) 13 × 18

Correct Answer: A

Explanation:

Numbers like 5, 25, and 50 make this strategy easy to use.

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Question (8)

QN0032702

Using doubling and halving, 50 × 28 becomes

(A) and
(B)
(C) Both
(D) 14 × 50

Correct Answer: C

Explanation:

Both 25 × 56 and 100 × 14 have the same product as 50 × 28.

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Question (9)

QN0032703

Find the product of 25 × 12.

(A) 250
(B) 275
(C) 300
(D) 325

Correct Answer: C

Explanation:

25 × 12 = 50 × 6 = 100 × 3 = 300.

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Question (10)

QN0032704

Which statement about doubling and halving is correct?

(A) It changes the product.
(B) It works only for multiplication by 2.
(C) It is useful for multiplying by numbers like 5 and 25.
(D) It can be used only for one-digit numbers.

Correct Answer: C

Explanation:

The doubling and halving strategy is especially useful when one factor is 5, 25, 50, or similar numbers.

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Question (1)

Which multiplication can be solved easily by using the doubling and halving strategy?

Explanation:

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Question (2)

In the doubling and halving strategy, what happens to the product when one factor is doubled and the other factor is halved?

Explanation:

Link:

Question (3)

Using doubling and halving, 5 × 24 can be written as

Explanation:

Link:

Question (4)

Find the value of 25 × 8 using doubling and halving.

Explanation:

Link:

Question (5)

Which pair of numbers is obtained after one step of doubling and halving 16 × 5?

Explanation:

Link:

Question (6)

What is 18 × 5?

Explanation:

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Question (7)

Which multiplication is most suitable for the doubling and halving strategy?

Explanation:

Link:

Question (8)

Using doubling and halving, 50 × 28 becomes

Explanation:

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Question (9)

Find the product of 25 × 12.

Explanation:

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Question (10)

Which statement about doubling and halving is correct?

Explanation:

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